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Steam pretreatment of Salix to upgrade biomass fuel for wood pellet production
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Energy and Furnace Technology.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Energy and Furnace Technology.ORCID iD: 0000-0002-1837-5439
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Energy and Furnace Technology.
2011 (English)In: Fuel processing technology, ISSN 0378-3820, E-ISSN 1873-7188, Vol. 92, no 9, 1711-1717 p.Article in journal (Refereed) Published
Abstract [en]

Steam explosion (SE) pretreatment is served to separate the main components of woody biomass. In general there is a noticeable gap in literature in terms of application of steam explosion process to upgrade biomass fuel for wood pellet production. In order to study the influence of steam explosion pretreatment on biomass fuel, Salix wood chips was used as raw material. Four different SE experiments were performed by varying two key process factors; time and temperature. Elementary quality and ash properties of the pretreated residue were investigated. Moreover, physical and thermochemical properties of the pellet, produced from the residue, were also investigated. Reduction in ash content especially in alkali metals was observed in steam treated residue. Pretreatment of biomass also enhanced carbon content and reduced oxygen amount in the fuel which enhanced the heating value of the fuel. Moreover, pretreatment enhanced pellet density, impact resistance, and abrasive resistance of pellet. However, small degradation in ash fusion characteristics and char reactivity was also observed as the severity of the process increased.

Place, publisher, year, edition, pages
2011. Vol. 92, no 9, 1711-1717 p.
Keyword [en]
Steam explosion, Pretreatment, Pellet, Combustion, Pyrolysis, Upgraded biomass fuel
National Category
Chemical Process Engineering
Identifiers
URN: urn:nbn:se:kth:diva-37136DOI: 10.1016/j.fuproc.2011.04.017ISI: 000292672900006Scopus ID: 2-s2.0-79958151973OAI: oai:DiVA.org:kth-37136DiVA: diva2:432327
Note
QC 20110802Available from: 2011-08-02 Created: 2011-08-02 Last updated: 2017-12-08Bibliographically approved
In thesis
1. Thermochemical behavior of pretreated biomass
Open this publication in new window or tab >>Thermochemical behavior of pretreated biomass
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Mankind has to provide a sustainable alternative to its energy related problems. Bioenergy is considered as one of the potential renewable energy resources and as a result bioenergy market is also expected to grow dramatically in future. However, logistic issues are of serious concern while considering biomass as an alternative to fossil fuel. It can be improved by introducing pretreated wood pellet.

The main objective of this thesis is to address thermochemical behaviour of steam exploded pretreated biomass. Additionally, process aspects of torrefaction were also considered in this thesis. Steam explosion (SE) was performed in a laboratory scale reactor using Salix wood chips. Afterwards, fuel and thermochemical aspects of SE residue were investigated. It was found that Steam explosion pretreatment improved both fuel and pellet quality. Pyrolysis of SE residue reveals that alerted biomass composition significantly affects its pyrolysis behaviour. Contribution from depolymerized components (hemicellulose, cellulose and lignin) of biomass was observed explicitly during pyrolysis. When devolatilization experiment was performed on pellet produced from SE residue, effect of those altered components was observed. In summary, pretreated biomass fuel characteristics is significantly different in comparison with untreated biomass. On the other hand, Process efficiency of torrefaction was found to be governed by the choice of appropriate operating conditions and the type of biomass.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. vi, 56 p.
Keyword
Biomass, Pretreatment, therochemical conversion, pyrolysis, combustion
National Category
Chemical Process Engineering
Research subject
SRA - Energy
Identifiers
urn:nbn:se:kth:diva-53060 (URN)978-91-7501-228-5 (ISBN)
Presentation
2012-01-26, B2, Brinellvägen 23, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
StandUp
Note
QC 20120110Available from: 2012-01-10 Created: 2011-12-21 Last updated: 2012-01-19Bibliographically approved

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Yang, Weihong

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